Bolster-spring.



No. -7|0,398. Patented Oct. 7, I902..

E. B. a. c. E. ADAMS.

BOLSTER SPRING.

(Application filed Aug. 29, 1901.)

' (no Model.)

UNITED STATES Fries. I

ATENT EDWARD B. ADAMS AND CLARENCE E: ADAMS, OF RACINE, WISCONSIN.

BOLSTER-SPRING.

SPECIFICATION formingpart of Letters Patent No. 710,398, dated October '7, 1902. Application filed August 29, 1901. Serial No. 73,645. (No model.)

To all whom it may concern.-

Be it known that we, EDWARD B. ADAMS and CLARENCE E. ADAMS, citizens of the United States, and residents of Racine, in the county of Racine and State of Visconsin, have invented certain new and useful Improvements in Bolster-Springs; and we do hereby declare that the followingis a full, clear, and exact description thereof.

Our invention has for its object to provide two-bar bolster-springs having economical antibuckling end plates that serve to prevent splitting or checking of the bars to which they are bolted, (these bars being of wood,) as well as to prevent the semi-elliptic springs from getting out of position or twisting; and which will not cut the bolster-stakes, said invention consisting in certain peculiarities of construction and combination of parts hereinafter particularly set forth with reference to the accompanying drawings and subsequently claimed.

Figure 1 of the drawings represents a side elevation of a portion of our improved bolsterspring; Fig. 2, a sectional view of" the same, indicated by line 2 2 in the first figure; and Fig. 3, a perspective view of an end plate constituting part of said spring.

Referring by letter to the drawings, A indicates a flat-top metal plate that is preferably a malleable-iron casting, this plate being provided with bolt-holes 1), depending transverse ears 0 (Z, and a pair of depending longitudinal side flanges 6, connecting the extremities of the innermost ears cl, the ears 0 cl being paired. Parallel wooden bars B are held by clips on semi-elliptic springs that have their extremities in connection with rockers for which bearing-plates are provided, said bars, semi-elliptic springs, rockers, and bearing-plates being embodied in a wellknown type of bolster-spring that also embodies end plates devoid of the ears and flanges herein specified and which have been found unsatisfactory in practice. In accordance with our invention ends of the bars B fit between ears 0 d of each plate A of the bolster-spring of the type shown and de scribed, said bars and plate being bolted together. The plate-ears prevent the bars from splitting or checking incidental to jars and strains to which the bolster-spring is subjected, and the depending side flanges c of the plate between the innermost ears d brace these ears and strengthen said plate to such an extent as to prevent buckling of the same under strains to which bolsterspring end plates are ordinarily subjected, the aforesaid plate being very light in proportion to its rigidity. It has also been found that the semielliptic members of our improved bolsterspring do not twist or get out of position, and the end plates do not cut bolster-stakes.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-- In a bolster-spring of the type comprising rocker-connected semi-elliptic springs, Wooden bars secured on the springs and end plates bolted to the bars; ears depending in pairs from the plate transversely of the same against opposite sides of the bars, and earconnecting side flanges that also depend from said plate longitudinally thereof.

In testimony that we claim the foregoing we have hereunto set our hands, at Racine, in the county of Racine and State of Wisconsin, in the presence of two witnesses.

EDWARD B. ADAMS. CLARENCE E. ADAMS.

Witnesses:

ALBERT L. ANDERSON, HAROLD S. BLIss. 

